Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Building Environment and Energy Engineering | en_US |
| dc.contributor.advisor | Lu, Lin Vivien (BEEE) | en_US |
| dc.creator | Li, Songlin | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/14091 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Energy saving efficiency of Passive Daytime Radiative Cooling in different climate cities | en_US |
| dcterms.abstract | This dissertation investigates the energy efficiency and environmental implications of Passive Daytime Radiative Cooling (PDRC) technology in building applications across diverse climate zones in China. Conventional roofing materials, characterized by low solar reflectivity, can elevate rooftop temperatures by up to 40°C above ambient air. This exacerbates cooling demands and contributes to urban thermal discomfort. Recent advancements in material science have facilitated the development of materials with high solar reflectivity and emissivity, offering significant radiative cooling potential. However, these PDRC materials may also increase heating demands during winter. This study employs software simulations to assess the energy consumption of buildings in six different climate zones in China, comparing the performance of six common roofing materials. The analysis focuses on cooling load reduction, heating loss and carbon emission reduction across different regions. The results indicate that in the southern subtropical region, high-performance PDRC materials have excellent energy-saving potential, with ambient temperatures consistently exceeding rooftop temperatures. In this region, the reduction in cooling load compensates for the increase in heating demand, achieving an energy savings efficiency of approximately 35% and a carbon emissions reduction of 40%. Conversely, northern regions, particularly the cold climates of Northeast China, prioritize insulation, requiring materials with low emissivity and reflectivity. In these areas, high-performance materials may increase energy consumption, requiring a cautious approach to their application. This dissertation provides a theoretical framework for the strategic deployment of PDRC technology in buildings across diverse climatic conditions, supporting global efforts in building energy conservation and carbon emission reduction. | en_US |
| dcterms.extent | 63 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2025 | en_US |
| dcterms.educationalLevel | M.Eng. | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8545.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.5 MB | Adobe PDF | View/Open |
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